The various parts of the endomembrane system serve different functions in the cell. in this activity, you will identify the roles of each part of the endomembrane system. -a. smooth er, b. rough er, c. golgi apparatus, d. lysosomes 1. protein synthesis 2. cisternal maturation 3. lipid synthesis 4. calcium ion storage 5. protein modification and sorting 6. poison detoxification 7. macromolecule digestion 8. autophagy